Gravity is not a force.
Under general relativity, gravity is not a force. Instead it is a distortion of spacetime. Objects in free-fall move along geodesics (straight lines) in spacetime, as seen in the inertial frame of reference on the right. When standing on Earth we experience a frame of reference that is accelerating upwards, causing objects in free-fall to move along parabolas, as seen on the left.
In this system there is only one space dimension, shown on the vertical axis and labeled in meters. The time dimension is the horizontal axis and labeled in seconds. The gravitational field is constant within the area of interest.
Use this demo to see and feel this!
https://timhutton.github.io/GravityIsNotAForce/
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Post #718
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